UV Index in Si Ma Cai, Vietnam

Last updated: May 3, 2025

In Si Ma Cai, Vietnam, awareness of the UV Index is crucial for maintaining skin health and preventing sunburn. Understanding the daily UV levels helps residents and visitors alike take proactive measures against the harmful effects of ultraviolet radiation, especially during peak hours when the index reaches a staggering 14 around noon. With a Cwa climate, characterized by distinct seasons and significant sun exposure, Si Ma Cai presents unique challenges in UV protection. By staying informed about the UV Index, you can enjoy the beauty of this region while safeguarding your skin from potential damage.

Hourly UV Index in Si Ma Cai

As the sun rises, the UV Index begins its ascent, with a gentle maximum of 2 at 07:00. The intensity ramps up quickly, hitting 4 by 08:00 and dramatically soaring to a peak of 14 between 11:00 and 12:00. This highlights the midday sun's strength, making it essential to take precautions during those hours. By 01:00, the index slightly declines to 13, before tapering off to 10 at 14:00. As the afternoon progresses, the UV exposure drops significantly, recorded at 6 by 15:00 and continuing to decrease to 1 by 17:00 and 18:00. With the sunset approaching, the UV Index reaches 0 at 19:00, signaling that the day's perilous rays have retreated, allowing for a more relaxed evening.🌞

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
Time	UVI	Category	Time to Burn
07:00	2	low	45 min
08:00	4	moderate	30 min
09:00	8	very high	15 min
10:00	11	extreme	10 min
11:00	14	extreme	10 min
12:00	14	extreme	10 min
13:00	13	extreme	10 min
14:00	10	very high	15 min
15:00	6	high	25 min
16:00	3	moderate	30 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Si Ma Cai

The UV Index experiences significant seasonal changes, peaking during the warmer months. From January to April, the index starts off high at 8 and escalates to 13 by April. However, the most critical period for UV exposure arrives in May through October, where the index remains between 14 and 15, categorized as extreme with a burn time of just 10 minutes. July marks the highest UV Index at 15, making it a particularly high-risk month for sunburn. As we transition to November and December, the index decreases to 9 and 8 respectively, returning to a very high exposure category but allowing a longer burn time of 15 minutes. Visitors and residents are strongly advised to take precautionary measures, especially from March to October, to minimize UV exposure by seeking shade, wearing protective clothing, and applying broad-spectrum sunscreen regularly.

Monthly Maximum UV Index for Si Ma Cai, Vietnam

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Si Ma Cai. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Si Ma Cai, based on information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

Compare Si Ma Cai UV Index with Other Vietnam Cities

The table above highlights how UV exposure in Si Ma Cai compares to other major locations across Vietnam. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Si Ma Cai's solar exposure compared to other cities in Vietnam. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Hanoi UVI	8	10	12	12	13	12	12	13	13	11	9	7
Haiphong UVI	8	10	12	13	12	13	13	13	13	11	9	7
Si Ma Cai	8	10	12	13	14	14	15	14	13	12	9	8
Da Nang UVI	10	12	14	15	14	13	14	14	13	12	10	9
Ho Chi Minh City UVI	10	13	15	14	14	12	13	14	13	13	11	10
Bien Hoa UVI	10	14	15	15	14	13	14	14	13	12	11	10